Added a check to stop the creation of a Table with 0 columns or rows.

Word dose not let you do this and DocX aims to create documents that Word can open.

DocX/DocX.cs

         /// </example>
         public Table InsertTable(int coloumnCount, int rowCount)
         {
+            if (rowCount < 1 || coloumnCount < 1)
+                throw new ArgumentOutOfRangeException("Row and Coloumn count must be greater than zero.");
+
             Table t = base.InsertTable(coloumnCount, rowCount);
             t.mainPart = mainPart;
             return t;
 
         public Table AddTable(int rowCount, int coloumnCount)
         {
+            if (rowCount < 1 || coloumnCount < 1)
+                throw new ArgumentOutOfRangeException("Row and Coloumn count must be greater than zero.");
+
             return (new Table(this, HelperFunctions.CreateTable(rowCount, coloumnCount)));
         }
 
         /// </example>
         public Table InsertTable(int index, int coloumnCount, int rowCount)
         {
+            if (rowCount < 1 || coloumnCount < 1)
+                throw new ArgumentOutOfRangeException("Row and Coloumn count must be greater than zero.");
+
             Table t = InsertTable(index, coloumnCount, rowCount);
             t.mainPart = mainPart;
             return t;

DocX/Table.cs

                 throw new IndexOutOfRangeException();
 
             List<XElement> content = new List<XElement>();
-                        
-            foreach (Cell c in Rows[0].Cells)
+            for (int i = 0; i < columnCount; i++ )
                 content.Add(new XElement(XName.Get("tc", DocX.w.NamespaceName), new XElement(XName.Get("p", DocX.w.NamespaceName))));
 
             XElement e = new XElement(XName.Get("tr", DocX.w.NamespaceName), content);